Two local men and eight migrants were injured in a massive explosion of magnesium and aluminum powder at a factory that specialized in manufacturing bike parts in central Taiwan on Wednesday.

Changhua County Fire Brigade received an emergency call just before 3pm on May 2 from a factory at Section 3 in Zhongshan Road after a metal dust explosion. Ten workers suffered burn injuries of varying degrees, the China Times reported.

The injured workers were sent to Changhua Christian Hospital. Five had sustained minor injuries with burns from just 3% to 7% of their body surface.

However, four other workers were in a serious condition, with burns from 30% to 70% of their bodies, while a Taiwanese man surnamed Wu was reported to be in a critical condition with 100% burns all over his body and put in a special burns unit.

A preliminary investigation found that magnesium and aluminum powder had accumulated in a 10-square-meter work area where metal scraping was done. The powder had been ignited by spark, which set off a massive and sudden explosion.